class ActionDispatch::PublicExceptions
When called, this middleware renders an error page. By default if an HTML response is expected it will render static error pages from the /public
directory. For example when this middleware receives a 500 response it will render the template found in /public/500.html
. If an internationalized locale is set, this middleware will attempt to render the template in /public/500.<locale>.html
. If an internationalized template is not found it will fall back on /public/500.html
.
When a request with a content type other than HTML is made, this middleware will attempt to convert error information into the appropriate response type.
Attributes
Public Class Methods
Source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 17 def initialize(public_path) @public_path = public_path end
Public Instance Methods
Source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 21 def call(env) request = ActionDispatch::Request.new(env) status = request.path_info[1..-1].to_i begin content_type = request.formats.first rescue ActionDispatch::Http::MimeNegotiation::InvalidType content_type = Mime[:text] end body = { status: status, error: Rack::Utils::HTTP_STATUS_CODES.fetch(status, Rack::Utils::HTTP_STATUS_CODES[500]) } render(status, content_type, body) end
Private Instance Methods
Source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 35 def render(status, content_type, body) format = "to_#{content_type.to_sym}" if content_type if format && body.respond_to?(format) render_format(status, content_type, body.public_send(format)) else render_html(status) end end
Source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 44 def render_format(status, content_type, body) [status, { "Content-Type" => "#{content_type}; charset=#{ActionDispatch::Response.default_charset}", "Content-Length" => body.bytesize.to_s }, [body]] end
Source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 49 def render_html(status) path = "#{public_path}/#{status}.#{I18n.locale}.html" path = "#{public_path}/#{status}.html" unless (found = File.exist?(path)) if found || File.exist?(path) render_format(status, "text/html", File.read(path)) else [404, { "X-Cascade" => "pass" }, []] end end